The British tourists who reportedly has a grenade thrown at them in Kenya were travelling in a van from Diani in Kwale to Mombasa when it was targeted as it slowed down, police told the Kenya-based Standard Digital.
"He vanished soon after he hurled the explosive," police chief Robert Kitur told the paper.
The grenade failed to explode and is being examined by police.
The attack comes on the same day Kenya celebrates 50 years of independence from British colonialist rule.
More top news
Actress who plays iconic Daenerys Targaryen admitted she didn't want to become typecast for nudity.
Details of the In/Out referendum will be presented to Parliament in a Bill this morning.
Windy and wet weather to end the month of May